/Engine/Source/Runtime/Engine/Classes/Components/InstancedStaticMeshComponent.h
Lightweight interface to add, remove and update instances.
True on success
virtual bool UpdateInstances ( const [TArray](API\Runtime\Core\Containers\TArray)< int32 > & UpdateInstanceIds, const [TArray](API\Runtime\Core\Containers\TArray)< FTransform > & UpdateInstanceTransforms, const [TArray](API\Runtime\Core\Containers\TArray)< FTransform > & UpdateInstancePreviousTransforms, int32 NumCustomFloats, const [TArray](API\Runtime\Core\Containers\TArray)< float > & CustomFloatData )